2-(Diethylamino)ethyl 2-((2,3-dimethylphenyl)amino)benzoate monohydrochloride 55098-70-9 Benzoic acid, 2-((2,3-dimethylphenyl)amino)-, 2-(diethylamino)ethyl ester, monohydrochloride Mefenamic acid diethylaminoethyl ester